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Laars endurance boiler (does heat and hot water)
for the last few weeks the hot water has been eratic. It will start hot then drop off in seconds then I would adjust the water hoter at the sink tap or shower and it would ok for about 30 seconds then get very hot and I would have to keep adjusting it though out a shower or doing dishes.
Yesterday it got very cold, I see a F4 error code. The book said to check the Supply sensor. normal is 10k ohms at 77F and replace sensor if it reads les then 500 or more then 20k.
Iam getting 14k but the tank is still warm (about140F).
I check the wires from the sensor to the control and they are fine.
I have worked on Gas and eletric heaters before but have little experiance with boilers. Iam thinking I need a new boiler control.
Anyone have any suggestions?